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It's not possible to delete an empty package. The dialog comes, but afterwards the package still stays there. Maybe there's a lock from Subversion in my case, but I see no report.
Is the project in some versioning system?
Yes, in Subversion.
If I remember correctly the package is physically deleted once the changes are committed to repository.
While the package is under SVN control, you have to do the deletion by following: 1. Switch to "Files" view. 2. Delete desired package and invoke "Subversion | Commit" action. Package should disappear. Closing as INVALID.
*** Issue 174064 has been marked as a duplicate of this issue. ***